Racial Disparities in Hypertension Among Young, Black and White Women

Device-estimated sleep metrics do not mediate the relation between race and blood pressure dipping in young black and white women

Short, disturbed, and irregular sleep may contribute to blunted nocturnal blood pressure (BP) dipping, a predictor of cardiovascular disease. Black women (BLW) demonstrate less BP dipping and poorer sleep health than White women (WHW). However, it remains unclear whether device-estimated sleep health metrics mediate the relation between race and BP dipping in young women. We hypothesized that the relation between race and BP dipping would be partly mediated by sleep health metrics of sleep duration, sleep efficiency, and sleep regularity. Participants (20 BLW, 17 WHW) were 18-29 years old, normotensive, nonobese, and without evidence of sleep disorders. Systolic and diastolic BP dipping were derived from 24-h ambulatory BP monitoring. Habitual sleep duration and sleep efficiency were estimated via 14 days of wrist actigraphy. Sleep duration regularity was calculated as the standard deviation (SD) of nightly sleep duration (SDSD). Sleep timing regularity metrics were calculated as the SD of sleep onset and sleep midpoint (SMSD). Mediation analysis tested the mediating effect of each sleep metric on the relation between race and BP dipping. BLW experienced less systolic (P = .02) and diastolic (P = .01) BP dipping. Sleep duration (P = .14) was not different between groups. BLW had lower sleep efficiency (P < .01) and higher SDSD (P = .02), sleep onset SD (P < .01) and SMSD (P = .01). No sleep metrics mediated the relation between race and BP dipping (all indirect effects P > .38). In conclusion, mediation pathways of sleep health metrics do not explain racial differences in nocturnal BP dipping between young BLW and WHW.

Examining hypertension risk among Black and White breast cancer survivors

PURPOSE

Breast cancer survivors are at increased risk of cardiovascular dysfunction following their diagnosis; however, hypertension remains underexplored within this context. This retrospective cohort study examined the incidence of hypertension in breast cancer survivors and the association of race with hypertension risk among them.

METHODS

Data for this study were abstracted from the electronic health records of women diagnosed with Stages I-III breast cancer. Incident hypertension diagnosis was identified through International Classification of Diseases codes. Bivariate associations were tested using Student's t-test and chi-squared test of independence. Bivariable Cox regression analysis was used to determine demographic and clinical factors that may have been associated with the development of hypertension.

RESULTS

A total of 664 women were included. Most women were 50 years of age or younger (52.0%), White (33.0% Black), and received a mastectomy (80.6%). Overall, 45.5% of the cohort developed hypertension. The 1-year hypertension-free survival estimates were 47% (95% confidence interval [CI], 41-54) in Black women and 73% (95% CI, 69-77) in White women (p < 0.0001). Besides race, statistically significant predictors of hypertension included: age greater than 50 (vs. ≤50) (adjusted Hazard Ratio [HR]: 1.40; 95% CI, 1.09-1.80) and residing in a non-metropolitan area (vs. metropolitan) (adjusted HR: 1.60; 95% CI, 1.19-2.16).

CONCLUSIONS

This study suggests that breast cancer survivors who are older, Black, or residing in non-metropolitan areas may benefit from added surveillance and hypertension prevention strategies during treatment. Future studies are needed to identify contributors to the observed racial and geographic disparities.

Elevated Blood Pressure and Aldosterone Dysregulation in Young Black Women Versus White Women on Controlled Sodium Diets

CONTEXT

Black women have a higher prevalence of hypertension as compared to White women. Differences in dietary sodium intake have been implicated as a contributing factor for the disparities in hypertension.

OBJECTIVE

Our objective was to understand whether young Black women would have higher systolic blood pressure (SBP) than White women even on controlled sodium diets and to determine whether SBP differences were due to differences in dietary sodium intake and/or aldosterone regulation.

DESIGN

The analyses included 525 hypertensive and normotensive women (ages 18-71) from the International Hypertensive Pathotype consortium, who were maintained on liberal sodium (LIB; >200 mEq sodium/day) and restricted sodium (RES; 10 mEq sodium/day) diets.

RESULTS

Multivariate regression analyses (adjusted for age, race, study site, body mass index) found that Black women (ages 18-50) had significantly higher SBP than White women on both sodium diets: +8.7 ± 2.7 mmHg (P-value = .002) on a LIB diet and +8.5 ± 2.5 mmHg (P-value = .001) on a RES diet. Even among 18- to 35-year-olds-who were normotensive and nonobese-Black women had higher SBP: +7.9 ± 2.4 mmHg (P-value = .001) on a LIB diet and +7.6 ± 2.7 mmHg (P-value = .005) on a RES diet. Younger Black women also had higher plasma aldosterone concentration to plasma renin activity ratio (ARR) on both LIB and RES diets as well as a higher sodium-modulated aldosterone suppression-stimulation index-an indicator of aldosterone dysregulation. In younger Black women-but not in White women-there was a significant association between SBP and ARR on both LIB and RES diets.

CONCLUSION

Young Black women had increased SBP and ARR as compared to White women on LIB and RES diets, which offers insights into the possible mechanisms for the increased hypertension and cardiovascular disease risk in an at-risk and understudied population.

Social and economic factors and black-white disparities in cardiovascular health: A decomposition analysis

Background

Cardiovascular health (CVH) in Black adults, and particularly in Black women, has lagged behind White adults for decades and contributes to higher mortality rates for Black adults. We quantified the contribution of five social and economic factors to observed racial disparities in CVH by gender.

Methods

We analyzed data from N = 8,019 adults aged ≥20 years free of cardiovascular disease assessed in the National Health and Nutrition Examination Survey, 2011-2018. Social and economic factors included self-reported education, income, employment, food security, and marital status. CVH was measured using eight behavioral and clinical indicators. We utilized Kitagawa-Blinder-Oaxaca decomposition to quantify gendered racial differences in CVH accounted for by these factors.

Results

Black women (mean CVH = 79.3) had a lower age-adjusted CVH score compared to White women (mean CVH = 82.3) (mean difference [MD] = -3.01; 95% CI: -5.18, -0.84). Social and economic factors accounted for a 3.26-point disadvantage (95% CI: -4.12, -2.40) and a 0.25-point CVH score advantage due to factors not accounted for in the model. In women, income had the largest coefficient associated with CVH score (b = -1.48; 95% CI: -2.04, -0.92). Among men, social and economic factors accounted for a 2.27-point disadvantage (95% CI: -2.97, -1.56) with educational attainment being the largest coefficient associated with CVH score (b = -1.55; 95% CI: -2.03, -1.06). However, the disadvantage in men was offset by a 1.99 CVH score advantage that was not accounted for by factors in the model resulting in no racial difference in age-adjusted CVH score (MD = -0.28; 95% CI: -3.78, 3.22).

Conclusions

Racial differences in social and economic factors may contribute a large portion to the observed disparity in CVH between U.S. Black and White women.

Patient-provider communication quality as a predictor of medical mistrust among young Black women

The present study explores the association between patient-provider communication quality and medical mistrust in a sample of 174 young Black women, aged 18-24. Data were collected as part of a larger mixed-methods study examining sexual health communication and behaviors. Participants were recruited via non-probabilistic sampling methods between June 2018 and December 2018. Eligible respondents completed a self-administered online study that examined, among other components, healthcare experiences and medical mistrust. Hierarchical linear regression was used to explore the relationship between patient-provider communication quality and medical mistrust. Patient-provider communication quality was a significant predictor of medical mistrust; as communication quality increased, medical mistrust decreased (p < .001). Educational attainment also emerged as a significant predictor. Relative to not completing any college, completing some college was associated with lower medical mistrust (p= .031). Our findings suggest that for providers seeking to address medical mistrust in patients identifying as young Black women, focusing on patient-centered communication may be particularly impactful.

Stress Reduction to Decrease Hypertension for Black Women: A Scoping Review of Trials and Interventions

INTRODUCTION

Chronic stress is a potential root cause of racial/ethnic disparities in cardiovascular disease. This review assesses literature surrounding effective stressreduction interventions to reduce hypertension (HTN)-a cardiovascular disease (CVD) risk factor-among an understudied population, non-Hispanic black (NHB) women.

METHODS

We conducted an electronic search of PubMed and PsycINFO literature published between January 1, 2000 and February 1, 2020, employing the keywords: "blood pressure", "hypertension", and "women", "black", "African-American", "stress", "meditation", "stress-coping", "stress-management", and "faith-based". We manually searched the bibliographies for additional articles. Studies were excluded if they: were published before 2000; were not intervention-based; did not study Black women in the US; did not target stress reduction; or did not measure blood pressure as an outcome. Independent reviewers screened the articles, which were selected based on consensus. Effect sizes and statistical p values were reported as provided in the included articles.

RESULTS

We identified 109 articles in total. Of those, six articles met inclusion criteria. Stronger evidence presented by a randomized control trial supported the efficacy of transcendental meditation with reductions in systolic and diastolic blood pressure up to 7 mmHg. Relaxation exercises, support groups, and therapeutic massage emerged as potentially beneficial in non-randomized pilot trials with reductions in systolic BP up to 9 mmHg and diastolic BP up to 5 mmHg varying by type and duration of the intervention.

CONCLUSIONS

This scoping review found that faith-based strategies and meditation can be effective stress reduction techniques to reduce BP among NHB women. However, much remains to be known about how these strategies may be leveraged to reduce blood pressure within this highly vulnerable population.